Network Slowness on my T1 Circuit

I have a T1 and as of the past few days its been very slow. I have a solarwinds network performance montior installed and its telling me that my transmit rate on my T1 is at 97%. When looking at my netflow data it lists my top 5 transmitters. See below: They are all yahoo mail servers:

Maybe one or more of your users is sending attachments out via yahoo mail?

Is this inbound or outbound transmission?

Can you get a list of internal IPs to see who is hogging the bandwidth? (Is your monitor inside or outside of your firewall? Maybe you could set up an internal monitor to narrow down who is using what bandwidth? After you narrow it down you could look at those few machines to get a better idea of what the user/users is doing that is hogging up bandwidth)

Think about upgrading. I had a client that had a T1 line. We installed a business class cable modem that was 1/5 of the price and 20-30 times faster.

My monitor is on the outside, I have netflow configured on my Cisco Router. I wanted to cofnigure netflow on my cisco pix so I could monitor the inside LAN by the PIX 506E doesn't support netflow. Any ideas on how I can analyze the inside LAN? Thanks.

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This ended up to be an ISP issue. When I would do a simple ping to www.google.com I got replies but they were about 1000ms. I called the ISP and I'm not sure what they did but things magically got back to normal. They claim they didn't do anything. As far as why those yahoo servers were the 5 biggest tranmitters on my network, this is because employees that work there have thier yahoo email forwarded to their blackberry.

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